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Old 01-24-2013, 03:58 PM   #1
Lovelyvanity
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Question 2002 ford focus won't start? Crank angle sensor or upstream oxygen sensor?

2002 ford focus lx SOHC.
I was driving my focus and randomly decided it didn't want to go anymore. Coasted to side of road and shut it off. Tried to turn it back on and it just sat and cranked. Fuel pump and timing belt is just fine. Next things to try are replacing the upstream o2 sensor up and down are bad and have been for months. Crank angle sensor and coil pack. Which could cause it most likely not to start and could randomly go out while driving like that? When I try to start the car it's a soft steady crank sound. Please and thank you!
P.s. took off the valve cover and look how gunked up it is. Def time to change the oil.


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Old 01-24-2013, 06:03 PM   #2
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Did it make any kind of noise before it died?
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Old 01-24-2013, 11:13 PM   #3
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Did it make any kind of noise before it died?
None at all it didn't even shut off till I did. It was like all of a sudden the gas pedal didn't want to go down.
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Old 01-25-2013, 10:26 AM   #4
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With what you said i would not start throwing parts at it, especially O2 sensors. There are ways to check or have checked things that will eliminate the guess work. A compression test would be something i would start with like Tom said, just because the nature of that engine.
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Old 01-24-2013, 10:24 PM   #5
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You have the Focus SPI engine before you do anything do a compression test there very bad to drop the valve seats and loose compression

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Old 01-25-2013, 06:31 PM   #6
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Took the coil pack off.. Cracked all to hell. Just got a new coil pack and plugs
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Old 01-25-2013, 06:59 PM   #7
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I don't think that would prevent the gas pedal from going down, but yeah, it seems bad.
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Old 01-25-2013, 07:37 PM   #8
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Let's ask the obvious question,

IS the gas pedal working properly now?

Moving the throttle body pulley properly?

(i always start with the "stupid" questions....)

Luck!
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Old 01-25-2013, 09:33 PM   #9
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Let's ask the obvious question,

IS the gas pedal working properly now?

Moving the throttle body pulley properly?

(i always start with the "stupid" questions....)

Luck!
Throttle was perfect after. Here's a pic of how #4 on the coil pack looked. Changed the coil pack crank position sensor checked timing changed plugs. Engine still first seem to be getting spark.
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Old 01-25-2013, 09:59 PM   #10
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Seem to be getting?

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Originally Posted by Lovelyvanity View Post
Throttle was perfect after. Here's a pic of how #4 on the coil pack looked. Changed the coil pack crank position sensor checked timing changed plugs. Engine still first seem to be getting spark.
"Seem to be" is a red flag for me, it's something that needs to be tested to a firm conclusion, yes or no.

There are tools to test for spark, yet the simplest is to take the plugs out then connect them to their wires & lay them on a grounded metal surface & crank the engine (helper needed) so you can look for the spark at the plugs.

The valve cover is NOT grounded (supported by rubber gaskets) so find another handy spot!

Jumper cables are great for this, though car size are a bit unwieldy....

Cheers!
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